Blast sinks INS Sindhurakshak; experts blame battery fire, ammunition explosion

In the dangerous life of a submariner, his on-board bank of batteries is his trusted lifeline. Enemy sonar detectors, which pick up the faintest underwater sound from many kilometres away, continually listen, armed with depth charges to blow apart any enemy submarine they detect. To remain silent, a submarine moves on electrical power, with giant batteries silently rotating the propeller and allowing it to close in with the enemy and fire its lethal torpedoes. Then, moving urgently on high battery power, the submarine slips away.

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